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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa08e7aa4ab6730d9891ccccbe4d0bbb11b8fe3b55e92c0481a09d95bf88758' 
  AND token = 'suggeMyKGvf7L0wJW+H37+z70g5QodUdJ1dHY+NNdgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}